Fallback to keyboard on controller disconnect

src/Ryujinx.Input/HLE/NpadManager.cs

@@ -36,6 +36,7 @@ namespace Ryujinx.Input.HLE
         private bool _isDisposed;
 
         private List<InputConfig> _inputConfig;
+        private List<InputConfig> _requestedInputConfig;
         private bool _enableKeyboard;
         private bool _enableMouse;
         private Switch _device;
@@ -52,6 +53,7 @@ namespace Ryujinx.Input.HLE
             _gamepadDriver = gamepadDriver;
             _mouseDriver = mouseDriver;
             _inputConfig = [];
+            _requestedInputConfig = [];
 
             _gamepadDriver.OnGamepadConnected += HandleOnGamepadConnected;
             _gamepadDriver.OnGamepadDisconnected += HandleOnGamepadDisconnected;
@@ -89,14 +91,14 @@ namespace Ryujinx.Input.HLE
                     }
                 }
 
-                ReloadConfiguration(_inputConfig, _enableKeyboard, _enableMouse);
+                ReloadConfiguration(_requestedInputConfig, _enableKeyboard, _enableMouse);
             }
         }
 
         private void HandleOnGamepadConnected(string id)
         {
             // Force input reload
-            ReloadConfiguration(_inputConfig, _enableKeyboard, _enableMouse);
+            ReloadConfiguration(_requestedInputConfig, _enableKeyboard, _enableMouse);
         }
 
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
@@ -127,11 +129,13 @@ namespace Ryujinx.Input.HLE
         {
             lock (_lock)
             {
+                _requestedInputConfig = inputConfig?.ToList() ?? [];
+
                 NpadController[] oldControllers = _controllers.ToArray();
 
                 List<InputConfig> validInputs = [];
 
-                foreach (InputConfig inputConfigEntry in inputConfig)
+                foreach (InputConfig inputConfigEntry in _requestedInputConfig)
                 {
                     NpadController controller;
                     int index = (int)inputConfigEntry.PlayerIndex;
@@ -147,7 +151,17 @@ namespace Ryujinx.Input.HLE
                         controller = new(_cemuHookClient);
                     }
 
-                    bool isValid = DriverConfigurationUpdate(ref controller, inputConfigEntry);
+                    InputConfig activeConfig = inputConfigEntry;
+                    bool isValid = DriverConfigurationUpdate(ref controller, activeConfig);
+
+                    if (!isValid &&
+                        enableKeyboard &&
+                        inputConfigEntry is StandardControllerInputConfig &&
+                        TryGetKeyboardFallback(inputConfigEntry, out StandardKeyboardInputConfig fallbackConfig))
+                    {
+                        activeConfig = fallbackConfig;
+                        isValid = DriverConfigurationUpdate(ref controller, activeConfig);
+                    }
 
                     if (!isValid)
                     {
@@ -157,7 +171,7 @@ namespace Ryujinx.Input.HLE
                     else
                     {
                         _controllers[index] = controller;
-                        validInputs.Add(inputConfigEntry);
+                        validInputs.Add(activeConfig);
                     }
                 }
 
@@ -169,7 +183,7 @@ namespace Ryujinx.Input.HLE
                     oldControllers[i] = null;
                 }
 
-                _inputConfig = inputConfig;
+                _inputConfig = validInputs;
                 _enableKeyboard = enableKeyboard;
                 _enableMouse = enableMouse;
 
@@ -177,6 +191,79 @@ namespace Ryujinx.Input.HLE
             }
         }
 
+        private bool TryGetKeyboardFallback(InputConfig inputConfig, out StandardKeyboardInputConfig fallbackConfig)
+        {
+            fallbackConfig = null;
+
+            ReadOnlySpan<string> keyboardIds = _keyboardDriver.GamepadsIds;
+
+            if (keyboardIds.IsEmpty)
+            {
+                return false;
+            }
+
+            string keyboardId = keyboardIds[0];
+
+            using IGamepad keyboard = _keyboardDriver.GetGamepad(keyboardId);
+
+            if (keyboard == null)
+            {
+                return false;
+            }
+
+            fallbackConfig = new StandardKeyboardInputConfig
+            {
+                Version = InputConfig.CurrentVersion,
+                Backend = InputBackendType.WindowKeyboard,
+                Id = keyboardId,
+                Name = keyboard.Name,
+                PlayerIndex = inputConfig.PlayerIndex,
+                ControllerType = inputConfig.ControllerType,
+                LeftJoycon = new LeftJoyconCommonConfig<PhysicalKey>
+                {
+                    DpadUp = PhysicalKey.Up,
+                    DpadDown = PhysicalKey.Down,
+                    DpadLeft = PhysicalKey.Left,
+                    DpadRight = PhysicalKey.Right,
+                    ButtonMinus = PhysicalKey.Minus,
+                    ButtonL = PhysicalKey.E,
+                    ButtonZl = PhysicalKey.Q,
+                    ButtonSl = PhysicalKey.Unbound,
+                    ButtonSr = PhysicalKey.Unbound,
+                },
+                LeftJoyconStick = new JoyconConfigKeyboardStick<PhysicalKey>
+                {
+                    StickUp = PhysicalKey.W,
+                    StickDown = PhysicalKey.S,
+                    StickLeft = PhysicalKey.A,
+                    StickRight = PhysicalKey.D,
+                    StickButton = PhysicalKey.F,
+                },
+                RightJoycon = new RightJoyconCommonConfig<PhysicalKey>
+                {
+                    ButtonA = PhysicalKey.Z,
+                    ButtonB = PhysicalKey.X,
+                    ButtonX = PhysicalKey.C,
+                    ButtonY = PhysicalKey.V,
+                    ButtonPlus = PhysicalKey.Plus,
+                    ButtonR = PhysicalKey.U,
+                    ButtonZr = PhysicalKey.O,
+                    ButtonSl = PhysicalKey.Unbound,
+                    ButtonSr = PhysicalKey.Unbound,
+                },
+                RightJoyconStick = new JoyconConfigKeyboardStick<PhysicalKey>
+                {
+                    StickUp = PhysicalKey.I,
+                    StickDown = PhysicalKey.K,
+                    StickLeft = PhysicalKey.J,
+                    StickRight = PhysicalKey.L,
+                    StickButton = PhysicalKey.H,
+                },
+            };
+
+            return true;
+        }
+
         public void UnblockInputUpdates()
         {
             lock (_lock)
@@ -334,7 +421,7 @@ namespace Ryujinx.Input.HLE
             }
         }
 
-        internal InputConfig GetPlayerInputConfigByIndex(int index)
+        public InputConfig GetPlayerInputConfigByIndex(int index)
         {
             lock (_lock)
             {

src/Ryujinx/UI/ViewModels/Input/InputViewModel.cs

@@ -348,15 +348,19 @@ namespace Ryujinx.Ava.UI.ViewModels.Input
 
         private void LoadConfiguration(InputConfig inputConfig = null)
         {
+            InputConfig persistedConfig;
+
             if (UseGlobalConfig && Program.UseExtraConfig)
             {
-                Config = inputConfig ?? ConfigurationState.InstanceExtra.Hid.InputConfig.Value.FirstOrDefault(inputConfig => inputConfig.PlayerIndex == _playerId);            
+                persistedConfig = ConfigurationState.InstanceExtra.Hid.InputConfig.Value.FirstOrDefault(inputConfig => inputConfig.PlayerIndex == _playerId);
             }
             else
             {
-                Config = inputConfig ?? ConfigurationState.Instance.Hid.InputConfig.Value.FirstOrDefault(inputConfig => inputConfig.PlayerIndex == _playerId);
+                persistedConfig = ConfigurationState.Instance.Hid.InputConfig.Value.FirstOrDefault(inputConfig => inputConfig.PlayerIndex == _playerId);
             }
 
+            Config = inputConfig ?? GetDisplayedInputConfig(persistedConfig);
+
             if (Config is StandardKeyboardInputConfig keyboardInputConfig)
             {
                 ConfigViewModel = new KeyboardInputViewModel(this, new KeyboardInputConfig(keyboardInputConfig), VisualStick);
@@ -368,6 +372,18 @@ namespace Ryujinx.Ava.UI.ViewModels.Input
             }
         }
 
+        private InputConfig GetDisplayedInputConfig(InputConfig persistedConfig)
+        {
+            if (persistedConfig is not StandardControllerInputConfig)
+            {
+                return persistedConfig;
+            }
+
+            InputConfig activeConfig = _mainWindow?.ViewModel.AppHost?.NpadManager?.GetPlayerInputConfigByIndex((int)_playerId);
+
+            return activeConfig is StandardKeyboardInputConfig ? activeConfig : persistedConfig;
+        }
+
         private void FindPairedDeviceInConfigFile()
         {
             // This function allows you to output a message about the device configuration found in the file
@@ -475,11 +491,24 @@ namespace Ryujinx.Ava.UI.ViewModels.Input
         {
             _isChangeTrackingActive = false; // Disable configuration change tracking
 
+            bool shouldApplyKeyboardFallback = Config is StandardControllerInputConfig controllerConfig && controllerConfig.Id == id;
+
             LoadDevices();
 
-            IsModified = true;
-            RevertChanges();
-            FindPairedDeviceInConfigFile();
+            if (shouldApplyKeyboardFallback)
+            {
+                LoadConfiguration();
+                LoadDevice();
+                NotificationIsVisible = false;
+                IsModified = false;
+                NotifyChanges();
+            }
+            else
+            {
+                IsModified = true;
+                RevertChanges();
+                FindPairedDeviceInConfigFile();
+            }
             
             _isChangeTrackingActive = true; // Enable configuration change tracking